Heavy metal fractions and ecological risk assessment in sediments from urban, rural and reclamation-affected rivers of the Pearl River Estuary, China

Zhang, Guangliang; Bai, Junhong; Xiao, Rong; Zhao, Qingqing; Jia, Jia; Cui, Baoshan; Liu, Xinhui

doi:10.1016/j.chemosphere.2017.05.155

Cited by 278 publications

(115 citation statements)

References 57 publications

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“…The study of Xiao et al revealed the wetland reclamation elevated the accumulation of heavy metals in the soils of Cixi [61]. Zhang et al found that the reclamation processes in coastal areas resulted in serious contamination of heavy metals to the aquatic ecosystem of Pearl River Estuary [62]. All the studies above showed the land reclamation had negative effects on the aquatic ecosystems.…”

Section: Implication Of the Land Reclamation Ofmentioning

confidence: 99%

Spatial Distribution and Contamination Assessment of Heavy Metals in Surface Sediments of the Caofeidian Adjacent Sea after the Land Reclamation, Bohai Bay

Zhu

Bing

Huang

et al. 2018

Journal of Chemistry

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Land reclamation can significantly influence spatial distribution of heavy metals in inshore sediments. In this study, the distribution and contamination of heavy metals (Cd, Cr, Cu, Ni, Pb, and Zn) in inshore sediments of Bohai Bay were investigated after the land reclamation of Caofeidian. The results showed that the concentrations of Cd, Cr, Cu, Ni, Pb, and Zn in the sediments were 0. 20-0.65, 27.16-115.70, 11.14-39.00, 17.37-65.90, 15.08-24.06, and 41.64-139.56 mg/kg, respectively. These metal concentrations were generally higher in the area of Caofeidian than in other Chinese bays and estuaries. Spatially, the concentrations of Cd, Cr, Cu, Ni, and Zn were markedly lower in the sediments close to Caofeidian compared with other regions, whereas the concentrations of Pb showed an opposite case. Hydrodynamic conditions after the land reclamation were the major factor influencing the distribution of heavy metals in the sediments. Grain sizes dominated the distribution of Cu and Zn, and organic matters and Fe/Mn oxides/hydroxides also determined the distribution of the heavy metals. Multiple contamination indices showed that the inshore sediments were moderately to highly contaminated by Cd and slightly contaminated by other heavy metals. Similarly, Cd showed a high potential ecorisk in the sediments, and other metals were in the low level. Chromium contributed to higher exposure toxicity than other metals by the toxicity unit and toxic risk index. The results of this study indicate that after the land reclamation of Caofeidian the contamination and ecorisk of heavy metals in the sediments markedly decreased in the stronger hydrodynamic areas.

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Section: Implication Of the Land Reclamation Ofmentioning

confidence: 99%

Spatial Distribution and Contamination Assessment of Heavy Metals in Surface Sediments of the Caofeidian Adjacent Sea after the Land Reclamation, Bohai Bay

Zhu

Bing

Huang

et al. 2018

Journal of Chemistry

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“…However, some studies have shown that the main fraction of Zn is the reducible fraction, and the inconsistent results are associated with upper industrial or urban wastewater. Previous studies have shown that the labile fractions mainly originate from anthropogenic sources, whereas the non‐labile fractions commonly originate from natural processes …”

Section: Discussionmentioning

confidence: 99%

“…Owing to their variety of physical, chemical, and biological processes, including sedimentation, setting, desorption, precipitation, and adsorption, wetlands have long been recognized as an important sink for trace metals, so it is especially important to understand the distribution characteristics and pollution levels of trace metals during early restoration of wetlands. For total trace metal accumulation in soils, indices have been developed in the last decade to assess trace metal contamination and its ecological effects, including the threshold effect level (TEL) and probable effect level (PEL) guidelines, geo‐accumulation index (I geo ), enrichment factor (EF), potential ecological risk index (RI), and so on. However, many studies have concluded that a risk assessment based on the total concentrations of metals may overestimate the risk since the environmental behavior of metals depends strongly upon their specific chemical fractions and binding states .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is vital to understand and quantify trace metal speciation and to predict their mobility, bio‐availability, and potential environmental toxicity. Subsequently, many sequential extraction methods have been conducted to investigate trace metal speciation in soils . Among such methods, the Standards, Measurements and Testing Program of the European Commission (BCR) and the Tessier sequential extraction procedure are the most commonly used .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Planting Patterns on Trace Metals in Soils Following Wetland Restoration

Zhang

Deng

et al. 2018

CLEAN Soil Air Water

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To understand the effects of planting patterns on trace metal fractions in degraded wetland soils in the Jinjiang Estuary, the chemical speciation of trace metals (Cu, Cr, Zn, and Pb) before and after wetland restoration is analyzed based on a measurement and testing program. The results show that wetland restoration, in general, increases the ratios of Cu, Cr, Zn, and Pb in the acid‐soluble fraction and the ratios of Cr, Zn, and Pb in the residual fraction and decreases the ratios of Cr, Zn, and Pb in the reducible fraction and the ratios of Cu, Cr, Zn, and Pb in the oxidizable fraction; thus, the mobility of Cu increases, and the mobility of Cr, Zn, and Pb decreases. Moreover, the planting patterns influence the levels of Cu, Cr, Zn, and Pb to some extent. After wetland restoration, the levels of Cu show an upward trend, and the Pb levels exhibit a downward trend. However, the potential ecological risk of Cu, Cr, Zn, and Pb fail to decrease. The restoration time may have been too short. The results of this study indicate that the planting patterns influence the transformation of trace metal fractions in soil and affect the pollution degree and potential ecological risk, contributing to a better understanding of the effects of planting patterns on trace metals following wetland restoration. The results will be helpful for subsequent scientific research on wetland restoration.

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“…[55]. Since the 1980s, high-energy and high-emission industries, such as electroplating factories, plastics plants, papermaking factories and hardware factories, have done great damage to the water quality of Pearl River.…”

Section: Study Areamentioning

confidence: 99%

Pricing Industrial Discharge Quota (IDQ): A Model Reflecting Opportunity Cost of Performing Ecological Responsibility

Xieer

Chen

et al. 2018

Sustainability

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Abstract:The upper reaches of a river system are often trapped in the dilemma of choosing between industrial development and headwater protection. One of the solutions is eco-compensation, which, however, is a public-fiscal arrangement lacking inspiration and sustainability. Instead, industrial discharge quota (IDQ) was put forward as a marketized approach: the maximum industrial discharge a river can afford is allocated as quotas and quotas are allowed to be traded. However, what pricing principle in the primary market can IDQ price refer to? How can enough incentives be given to local governments when they are reluctant to implement emission reduction policy? Given that some previous studies have proven the influence of fiscal income and reputation on governments' incentives, this paper introduces these into our model as main factors. Through analysis, two models-government model and enterprise model-are formulated based on opportunity cost theory to deal with this problem. The first sets basic prices and the latter notifies enterprises' behaviors. Then, this paper applies our first model to a sample region, Fogang County in Pearl River Basin. The results demonstrate that the upstream can obtain adequate compensation for their opportunity loss and local governments can be with strong motivation by our method.

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Heavy metal fractions and ecological risk assessment in sediments from urban, rural and reclamation-affected rivers of the Pearl River Estuary, China

Cited by 278 publications

References 57 publications

Spatial Distribution and Contamination Assessment of Heavy Metals in Surface Sediments of the Caofeidian Adjacent Sea after the Land Reclamation, Bohai Bay

Spatial Distribution and Contamination Assessment of Heavy Metals in Surface Sediments of the Caofeidian Adjacent Sea after the Land Reclamation, Bohai Bay

Effects of Planting Patterns on Trace Metals in Soils Following Wetland Restoration

Pricing Industrial Discharge Quota (IDQ): A Model Reflecting Opportunity Cost of Performing Ecological Responsibility

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